That completely sucks. There's a cat-track on my home mountain that is always cut-up as heck, and I've caught an edge there more than once - and now I'm super duper careful any time I ski through that zone because I'm terrified of catching an edge and blowing out my knee or breaking something. This is just the WORST, and doing it in late January, too...no suggestions, just some mad sympathy for you here. Oh, wait, one suggestion, one I discovered when I had a nasty ankle sprain years ago. It was MUCH easier to sleep once I got a body pillow. I would rest my bum leg and that knee-high boot on top of the pillow and lie on my side, and it was just a heck of a lot easier to manage than when I was trying to sleep without. I believe that also counts as "elevating" it. Oh yeah, I have another piece of advice. If you wind up in one of those rocker-soled boots once you're putting weight on it, use a cane when you walk. Those rocker sole boots cause your bum leg to be quite a bit longer than the "good" one, and walking on those things without assistance can really do a number on your hips and lower back. Using a cane helps a ton with that.
Just remember, if it's possible to work on an equestrian technique at the trot or canter, it's also possible to work on it at the walk. Be interesting to hear what your horse thinks of your crutches and stuff. Huey got stung by a bee in August, right as I was mounting, and bucked, and I went flying. They thought I'd fractured my back or my pelvis, but I had major good luck and just did a lot of nasty soft-tissue damage. Next time I saw Huey, he was absolutely fascinated by my crutches. He had to sniff every single square millimeter of them - each one, in turn - and then he gave me a look like "how did you get two extra legs???"